Your second solution is buggy. It fails to find a non-matching record for the following:

my @data = (
    { id =>   1, start => 2, end => 3 },
    { id =>   2, start => 3, end => 5 },
    { id =>   3, start => 4, end => 5 },
    { id =>   5, start => 5, end => 6 },
);
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